What do I do? Apr 18, 6: I know this is a zombie thread, but do you have any insight about this problem for those of us who can start in safe mode? My iMac is a late 09 27" 10,1 and I have tried everything, including several clean installs of mavericks and Yosemite. While this problem started intermittently, and I was able to fix it in terminal mode by forcing a new startup account, now the white screen happens all the time, and nothing helps.
- After normal operation it boots up on a white screen.
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I do have full functionality in safe mode however, and am actually typing on the afflicted machine now. I have a hard time believing the gpu could have issues this extreme but still work in safe mode, but some have speculated maybe some vid card ram is corrupted I was convinced that this was a software problem, but I have reinstalled Yosemite 4 times, and mavericks twice. Clean both times.
What to do when your Mac displays a blank screen and the cursor after a macOS update
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Mac stuck on white screen? Here’s how to fix it.
Your welcome! Next I would try a couple of things: JackWhite JackWhite Linc Davis Linc Davis. Notebooks Speciality level out of ten: Any new ideas would be most welcome! MilanThaker Question: The second thing I suggest is hooking it up to an external monitor. I have not heard you mention anything about if it chimes or not at boot??? There are four built-in diagnostic LEDs on the main logic board that can help you to troubleshoot the computer.
The LEDs are located on the bottom left edge of the logic board under a piece of black mylar tape and can be seen when looking through the lower vents of the enclosure. LED 1 is located furthest to the left. The LED will remain on even when the computer has been shut down or put to sleep. I appreciate your advice, but I do not intend to open up my iMac phisically. From this I draw the conclusions that my hardware is working ok, but the error is somewhere on the software side. If it is software relate, you will be able to boot to the options menu - by holding down on the option key when booting - and the display will be proper.
You should also have proper display from your OS X install disk preinstall environment. If such is the case then I would start by running disk utilities from the install disk and repair the hard drive. If that doesn't solve the problem and you can get to disk utilities on the install disk, I would back up your data through target node or by putting the hard drive in an external enclosure, then format the hard drive using the write zeros option to prevent critical OS files from being written to bad sectors on the hard drive.
Then install OS X again.
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David Bell. I keep a copy of Snow Leopard install DVD on a flash drive just in case of problems, Have you tried force booting from the original install disc that came with your iMac. There seems to be many problems arising with Lion Personally I'm staying with Snow Leopard until things get ironed out by Apple. Make sure to push this key combination directly after the startup chime, and hold the keys until you hear the startup chime again. If you're able to get a normal boot and Lion loaded with a normal screen I would suggest putting a install on an external hard drive for future emergencies.
Added note: Once you're able to get your iMac up and running without the white screen check for firmware updates for your model.
If so or if you know someone who would let you try putting the hard drive from the iMac into another Mac to see if it boots normally which I'm pretty sure that it will. It all sounds like a hardware issue to me. Or if it's the original hard drive it may be failing, Are you still under Apple Care warranty? Hopefully you are and then take it in to an Apple Store but in the mean time I'll keep looking around on Google for possible answers.
Lion seems to be more trouble than it's worth right now, But like Microsoft and windows Apple keeps shoving it down everyones throat knowing it's a real piece of crap underneath the hood that's about to come flying off like in one of those movies after some cop just unloaded a shot gun into your engine. It's all about sales and making even more money, They forgot about the real Mac users once the iPad's and iPhones took off.
This is Horia Humaila. I've tried booting my original Snow Leopard The drive has 65GB left free, but doesn't matter how mutch I free it keeps saying it needs more. Can I back up my installed software and install from scratch Snow Leopard? Select a Language: Help Translate iFixit. Back Answers Index. Horia Humaila Rep: Hello, I pushed the power button on my 27 inch iMac from 11,1 model with Lion one day and left the room.
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